Calculator or abacus.



R. G. BENNETT.

CALCULATOR 0R ABAGUS.

APPLICATION FILED JUNE 21, 1913.

1,099,009, Patented June 2, 1914.

WITNESSES INVENTOH I u fiaxwiogiyja aw 6 ATTORNEYS ll N l'lE RANDOLPH CURTIS BENNETT, 0F JERSEY CITY, NEW JERSEY, ASSIGNDR 0F ONE-HALF TO AUGUSTTJ'S P. BENNETT, Q15 NEW? YORK, N. Y.

CALCULATOR OR ABACUS.

To all whom it may concern Be it known that I, RANDOLPH G. Brno NElT, a citizen of the United Eltates, and a resident of Jersey City, in the county of Hudson and State oi New Jersey, have invented a new and Improved Calculator or Abacus, of which the following is a full, clear, and exact description.

My invention relates to counting devices known as abaci and has reference more particularly to the frame structure, which comprises a member carrying the counting elements and provided with supports at the ends of such a shape that the said member is in normal position at all positions oi? the supports.

An object of the invention is to provide a simple, inexpensive and always centered device by means of which the first rules 01 arithmetic can be taught by the direct method.

Another object of the invention is to pro vide a counting device in which the member carrying the slidable counting elements is always in normal position in all positions of the supports carrying the member.

The invention consists of the construc tion and combination of parts to be more fully described hereinafter and fully set forth in the claims.

Reference is to be had to the accompanying drawings forming a part of this specification, in which like characters indicate corresponding parts in all the views and in which- Figure 1 is a perspective view 01 an embodiment of my invention; and Fig. 2 is an end view of same, partly broken away, showing the supports embodied in a resilient layer.

Before proceeding to the description of my invention it must be clearly understood that the supports carrying the longitudinal member on which the sliding counting elements are positioned could be of any desired polygonal form integral with the member, as shown in the drawing, or rigidly connected to the same. The longitudinal. member can also be circular in cross section or of any other suitable shape; and, similarly, the counting elements may have any desired shape,

Referring to the drawings, 3 represents a longitudinal member on which are a series of counting elements at adapted to slide on Specification of Letters Patent.

Application filed June 21, 1913.

Patented June 2, 1914.

Serial No. 775,975.

the longitudinal member. Each end of this lougitiulinal member is provided with a bent portion 5 at right angles to the longitudinal member 3 and substantially parallel to each other. The major pa rt of this bent portion 5 is bent into an equilateral triangle 6. The two equilateral triangles are parallel to each other and each lies in a plane with its portion 5, the plane itself being substantially perpendicular to the member 3 and the center of the triangles being in alinement with the member The triangles (l forming the supports for the longitudinal member 3 will maintain the same position, always in the center, no matter on which side of the triangles the support is carried. Therefore, in any position of the supports the longitudinal member 3 will be in its normal position. To prevent the scratching of furniture by the supports 6 the same are covered with a layer of rubber 7, or any other similar substance.

The advantage of my device for teaching children the first rules Of arithmetic will be easily a iipreciated, as the subject can be presented to them by a direct method. The device itself is light, not cumbersome, and can be easily carried. It will not injure furniture or other objects when the device is placed on the same for use, as the supports are provided with a protective layer, as described.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a device of the class described, a member; a plurality of sliding counting elements on said member; and supports at the ends of said member whereby the member is in normal position at any position of said supports.

2. In a device of the class described, a member; counting elements slidably mounted on said member; and supports at the ends of said member parallel to each other and adapted to niaintain said member in normal position at all positions of said support.

El. In a device of the class described, a member; slidable elements on the member; a polygonal support at each end. of said member whereby said member is in normal position at all positions of said polygonal supports.

t. In a device of the class described, a longitudinal member having at its end polygonal-shaped supports substantially normal to said member and parallel to each other and whereby said member is in normal position at all positions of said support; and counting elements slidably mounted on said member between said supports.

5. In a device of the class described am longitudinal member having its ends triangularly shaped and forming supports for said member whereby said member is in normal position at all positions of said triangular supports; and counting elements slidably mounted on said member intermediate said triangular supports.

6. In a device of the class described, a longitudinal member having its extremities shaped into equilateral triangles substantially normal to said member and parallel to each other, said equilateral triangles forming the support for said member and having their center in alinement With said member, said supports maintaining said member in normal position at all positions of said equilateral triangles; and counting elements on said member intermediate said equilateral triangle supports.

.7. In a device of the class described; a member; polygonal supports for said member whereby said member is in normal position at all positions of said supports; counting elements slidably mounted on said member intermediate the polygonal supports; and a protective cover on said polygonal supports for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

RANDOLPH CURTIS BENNETT.

Witnesses AUeUsTUs 1?. BENNETT,

HIRAM C. BENNETT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

